slap

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A sharp blow made with the open hand or with a flat object; a smack.
• noun The sound of such a blow.
• noun A sharp insult.
• intransitive verb To strike with the palm of the hand or a flat object.
• intransitive verb To cause to strike forcefully and loudly.
• intransitive verb To put or place quickly or carelessly.
• intransitive verb To subject to a legal obligation, such as a fine or court order.
• intransitive verb To impose (a legal obligation) on someone.
• intransitive verb To strike or beat with the force and sound of a slap.
• adverb Directly and with force.
• idiom (slap on the wrist) A nominal or token punishment.

from The Century Dictionary.

• To strike with the open hand or with something flat: as, to slap one on the back; to slap a child on the hand.
• To strike with; bring upon or against something with a blow.
• noun A blow given with the open hand, or with something flat.
• With sudden and violent force; plump; suddenly.
• An obsolete variant of slop.
• First-rate; of the best; “slap-up.”
• To break into gaps; break out (an opening), as in a solid wall.
• noun A narrow pass between two hills.
• noun A breach in a wall, hedge, or fence; a gap.
• noun A gap in the edge of a knife, etc.

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb To strike with the open hand, or with something broad.
• noun A blow, esp. one given with the open hand, or with something broad.
• adverb colloq. With a sudden and violent blow; hence, quickly; instantly; directly.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A blow, especially one given with the open hand, or with something broad and flat.
• noun The sound of such a blow.
• noun slang (uncountable) Makeup, cosmetics.
• verb To give a slap.
• verb To cause something to strike soundly.
• verb To place, to put carelessly.
• adverb Exactly, precisely

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a blow from a flat object (as an open hand)
• adverb directly
• verb hit with something flat, like a paddle or the open hand
• noun the act of smacking something; a blow delivered with an open hand